#ifndef __C_ARCH_I386_ATOMIC__
#define __C_ARCH_I386_ATOMIC__

#include "std/std.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifdef VIEWS_SMP_ENABLED
#define LOCK "lock ; "
#else
#define LOCK ""
#endif

/*
 * Make sure gcc doesn't try to be clever and move things around
 * on us. We need to use _exactly_ the address the user gave us,
 * not some alias that contains the same information.
 */
typedef struct { volatile int counter; } atomic_t;

#define ATOMIC_INIT(i)	{ (i) }

#define atomic_read(v)		((v)->counter)
#define atomic_set(v,i)		(((v)->counter) = (i))

static inline void atomic_add(int i, atomic_t *v)
{
#ifdef TEST_DBG_WIN32
#else

	__asm__ __volatile__(
		LOCK "addl %1,%0"
		:"=m" (v->counter)
		:"ir" (i), "m" (v->counter));

#endif
}

static inline void atomic_sub(int i, atomic_t *v)
{
#ifdef TEST_DBG_WIN32
#else

	__asm__ __volatile__(
		LOCK "subl %1,%0"
		:"=m" (v->counter)
		:"ir" (i), "m" (v->counter));

#endif
}

static inline int atomic_sub_and_test(int i, atomic_t *v)
{
#ifdef TEST_DBG_WIN32
	v->counter -= i;
	return (!v->counter) ? 1 : 0;
#else

	unsigned char c;

	__asm__ __volatile__(
		LOCK "subl %2,%0; sete %1"
		:"=m" (v->counter), "=qm" (c)
		:"ir" (i), "m" (v->counter) : "memory");
	return c;

#endif
}

static inline void atomic_inc(atomic_t *v)
{
#ifdef TEST_DBG_WIN32
#else

	__asm__ __volatile__(
		LOCK "incl %0"
		:"=m" (v->counter)
		:"m" (v->counter));

#endif
}

static inline void atomic_dec(atomic_t *v)
{
#ifdef TEST_DBG_WIN32
#else

	__asm__ __volatile__(
		LOCK "decl %0"
		:"=m" (v->counter)
		:"m" (v->counter));

#endif
}

static inline int atomic_dec_and_test(atomic_t *v)
{
#ifdef TEST_DBG_WIN32
	v->counter--;
	return (!v->counter) ? 1 : 0;
#else

	unsigned char c;

	__asm__ __volatile__(
		LOCK "decl %0; sete %1"
		:"=m" (v->counter), "=qm" (c)
		:"m" (v->counter) : "memory");
	return c != 0;

#endif
}

static inline int atomic_inc_and_test(atomic_t *v)
{
#ifdef TEST_DBG_WIN32
	v->counter++;
	return (!v->counter) ? 1 : 0;
#else

	unsigned char c;

	__asm__ __volatile__(
		LOCK "incl %0; sete %1"
		:"=m" (v->counter), "=qm" (c)
		:"m" (v->counter) : "memory");
	return c != 0;

#endif
}

static inline int atomic_add_negative(int i, atomic_t *v)
{
#ifdef TEST_DBG_WIN32
	v->counter += i;
	return (v->counter < 0) ? 1 : 0;
#else

	unsigned char c;

	__asm__ __volatile__(
		LOCK "addl %2,%0; sets %1"
		:"=m" (v->counter), "=qm" (c)
		:"ir" (i), "m" (v->counter) : "memory");
	return c;

#endif
}

static inline int atomic_add_zero_or_negative(int i, atomic_t *v)
{
#ifdef TEST_DBG_WIN32
	v->counter += i;
	return (v->counter <= 0) ? 1 : 0;
#else

	unsigned char c;

	__asm__ __volatile__(
		LOCK "addl %2, %0; setle %1"
		:"=m" (v->counter), "=qm" (c)
		:"ir" (i), "m" (v->counter) : "memory");
	return c;

#endif
}
#ifndef VIEWS_SMP_ENABLED

#define atomic_clear_mask(mask, addr) \
__asm__ __volatile__(LOCK "andl %0,%1" \
: : "r" (~(mask)),"m" (*addr) : "memory")

#define atomic_set_mask(mask, addr) \
__asm__ __volatile__(LOCK "orl %0,%1" \
: : "r" (mask),"m" (*addr) : "memory")

#else

#define atomic_clear_mask(mask, addr)	do { *(addr) &= ~(mask) } while (0)
#define atomic_set_mask(mask, addr)		do { *(addr) |= (mask); } while (0)

#endif

#ifdef __cplusplus
}
#endif
#endif
/* EOF */
